This modpack, as the name implies, adds units to the game rather than modifying them. The five buildings added are aqueduct pieces. While they look decent, it's static nature can make it look as just a wall painted blue on the top rather than an aqueduct. Also, the anchors for the bottom right and top left aqueduct end piece are not properly set, so it cannot be aligned properly with the other pieces. Units cannot walk under the aqueducts though they should be able to.
The units added are some hero units. The monk is unnatural, since it can't convert or heal even though it looks as it should. It can't attack either. A different class of unit could have been used for it. All the units added have ES graphics, no changes. Names of the units are in the language file attached.
I think it's a bit overambitious to try to make a complete aqueduct system, like 'If one section of aqueduct gets destroyed, then the aqueduct sections ahead of it should be changed so that no water runs through them' - which is going to be impossible or really, really hard. Rather, you can concentrate on improving the graphics you already have so that it looks and plays more natural. And fix the monk.